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Study on the origin of 64,XX/63,X karyotype in four sterile mares

Twenty four mares, demonstrating fertility disturbances, were cytogenetically investigated. In four mares (17%) the presence of two cell lines - 64,XX and 63,X - was found. Paternity testing for two of the above mares, based on blood typing and protein polymorphism, confirmed the status of mosaicism. No relationship between the occurrence of the X monosomy mares and the age of their parents was found